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A189487 as a simple table

na(n)
01
11
25
328
4185
51456
613267
7135598
81528193
918805240
10250522451
113585332554
1254774501025
13888739031116
1415249006695483
15275641537989766
165231788966650113
17103968303762747472
182157673505603964643
1946656574558459795522
201049037051211541521121

[1,1,5,28,185,1456,13267,135598,1528193,18805240,
 250522451,3585332554,54774501025,888739031116,
 15249006695483,275641537989766,5231788966650113,
 103968303762747472,2157673505603964643,
 46656574558459795522,1049037051211541521121]